Why should one call GC SuppressFinalize when implementing Dispose method?

Why should one call GC SuppressFinalize when implementing Dispose method?

Dispose method is called, it frees resources of the object. Dispose should call GC. SuppressFinalize so the garbage collector doesn’t call the finalizer of the object. To prevent derived types with finalizers from having to reimplement IDisposable and to call it, unsealed types without finalizers should still call GC.

What does GC SuppressFinalize do?

SuppressFinalize tells the GC that the object was cleaned up properly and doesn’t need to go onto the finalizer queue. It looks like a C++ destructor, but doesn’t act anything like one. The SuppressFinalize optimization is not trivial, as your objects can live a long time waiting on the finalizer queue.

When would you use a finalizer?

If you use an unmanaged object and hold a reference to it, you must implement a Finalizer to allow that unmanaged object to be cleaned up. Otherwise you will leak unmanaged (heap) memory. If you create a Finalize method (~Class in C#), even if it is empty, this will put the object on the finalize queue.

What is IDisposable interface?

IDisposable is an interface that contains a single method, Dispose(), for releasing unmanaged resources, like files, streams, database connections and so on.

When should I implement IDisposable?

in a class, you should implement IDisposable and overwrite the Dispose method to allow you to control when the memory is freed. If not, this responsibility is left to the garbage collector to free the memory when the object containing the unmanaged resources is finalised.

What is Gc WaitForPendingFinalizers ()?

Suspends the current thread until the thread that is processing the queue of finalizers has emptied that queue. public: static void WaitForPendingFinalizers();

Could you explain the difference between destructor Dispose and Finalize method?

Destructor implicitly calls the Finalize method, they are technically the same. Dispose is available with objects that implement the IDisposable interface. The destructor implicitly calls Finalize on the base class of the object.

When should we implement IDisposable interface?

What is the purpose of IDisposable interface?

IDisposable interface is to release unmanaged resources in C#.NET. IDisposable interface is to release unmanaged resources. This framework would detect that an object is no longer needed as soon as it occurs and automatically free up the memory.

When to use GC.SuppressFinalize ( this )?

Once you disposed the object, you should indeed call GC.SuppressFinalize (this);, like shown in an answer to the question “When should I use GC.SuppressFinalize ()?”. Code analysis’ CA1816 rule is also useful as well. Now, implementing IDisposable on objects which don’t have unmanaged resources looks quite weird and questionable.

When to call GC.SuppressFinalize in garbage collector?

IDisposable.Dispose should call GC.SuppressFinalize so the garbage collector doesn’t call the finalizer of the object. To prevent derived types with finalizers from having to reimplement IDisposable and to call it, unsealed types without finalizers should still call GC.SuppressFinalize.

Is it possible to use SuppressFinalize on other objects?

The SuppressFinalize optimization is not trivial, as your objects can live a long time waiting on the finalizer queue. Don’t be tempted to call SuppressFinalize on other objects mind you.

What’s the best way to avoid GC pressure?

An elegant solution is the System.Buffers.ArrayPool class found in the Systems.Buffers NuGet. The idea is pretty similar to to the ThreadPool. A shared buffer for arrays is allocated, which you can reuse without actually allocating and de-allocating memory.